At frequency 0-3 Hz.
Like computer processors which can work at low frequencies and controlling under- and overvoltage.

Normal most significant channels are Ca2+ and K+ that are changing.
However, I am not convinced that they can work with such a low frequencies.
There must be some other channels that are triggering the extrasystole on.

Which ionic channels of Pacemakers can work in 2-3 Hz triggering extrasystole?